Ukraine turmoil

The conflict in Ukraine has deepened with Russian military forces reportedly moving to secure important sites in Crimea following the ouster of the country's pro-Russian president at the end of February. President Barack Obama said in a statement the U.S. is "deeply concerned" about the escalating situation. The violence that broke out Feb. 18 was the worst in the country's post-Soviet history.

A pro-Russian man wearing the Russian national flag walks past an entrance to the General Staff Headquarters of the Ukrainian Navy as unidentified gunmen stand outside in Sevastopol, Ukraine, on March 3, 2014.